Fast forward several years, now. Gina completed High School, went on to college to study art, and is nearing completion of her degree. The dynamics of our family have grown and expanded over time. Gina gained confidence and, of course, intense pleasure from her new role in the family, but her focus and direction were somewhat different from her mothers.
Mary's primary preferences were emotionally humiliating me, semi-feminizing me, and enjoying a plethora of large, young, virile cocks to suck and fuck and play with, finishing with me to orally clean her and her lovers when they were done. Gina also enjoyed this, although she did not often bring a boyfriend home to participate, like her mother did.
She did, however, lean much more to the bisexual side than Mary, gaining intense pleasure from showing off to her girlfriends her increasing confidence and ability to dominate a male, her father. Additionally, Gina was much more into sadism than Mary; she really got sexual highs from inflicting pain, most often in the form of CBT on me, regardless of whether we were alone, with Mary, or with others. She researched the internet extensively and convinced me to either buy or build a collection of toys and devices for her to experiment with.
One weekend, shortly after starting college, she came home and brought her girlfriend with her. She called from her car on the way. "Hi, Daddy, just we'll be there in about 30 mins. Sue is with me, be ready for us, Daddy, be very ready", she giggled and hung up.
Mary and I had not met Sue, yet, but had heard about her from Gina. We knew that Gina had trusted her enough to tell her about the relationship between Mary and I, and that she also participated in that. Nonetheless, it was scary to know that I would be exposed and dominated by her in front of someone I'd never met, a young 19-something year old girl, at that.
Not quite knowing what to expect, Mary and I talked and she decided I should wear panties, stockings and a camisole under some thin silk pants she had bought me, and an equally thin shirt. I would not be blatantly exposed, but the lingerie would be clearly visible with anything more than a 1 second glance. Mary, realizing that Gina would quite possibly want full access to my cock and balls, unlocked the CB6000 that I had been wearing since Gina had found them on the web and insisted that I buy for myself about a year ago. Both Mary and Gina had a key to the small padlock which prevented me from removing it myself.
"I trust Gina completely, slut," Mary said, "if she trusts Sue with this, then so do I. just because you don't know her is not even close to a reason to embarrass Gina and I, in fact the reverse. It makes it even more important that if Gina decides to torment, humiliate or otherwise dominate you, then you will enthusiastically accept and obey instantly. Do I make myself clear?"
"Yes, Ma'am, yes, you do"
"Good. Furthermore, I hope it goes without saying that if Gina invites Sue to do or say anything, you will give her the utmost respect. She is a woman, and she deserves it."
Just as I was about to answer, we heard a car door slam outside and knew they had arrived. I rushed downstairs, glancing at the kitchen where I had put wine in an ice bucket and set out glasses for everyone, and went to the front door. I saw their silhouettes through the glass of the door, and opened it as they reached the front porch.
Any doubts I had about Gina's intentions were instantly answered by her greeting. She gave me a kiss on the cheek and then "Hi, Daddy. Sue, this is our slave and slut. Come on in and meet my Mom. Our bags are in the car, Panty-Man, get them and take them into our bedroom."
Sue smirked at me with wide eyes as they travelled up and down my body.
"It's a pleasure to meet you, Sue, I hope you will feel completely at home here this weekend."
She giggled and followed Gina into the house, while I went out to the car and retrieved each of their bags and carried them in and took them down the hall into Ginas' bedroom. By the time I returned Gina, Sue and Mary were sitting together in the living room.
I hurried to the kitchen, opened the Reisling (Gina had developed a taste for sweeter wines), and carried it in the ice bucket, and the glasses over to them. As I poured the wine, I felt Ginas' eyes examining me. "I see you were a little shy getting dressed, Daddy. There's no need for that. Sue knows all about what a panty slut you are, and has been looking forward to seeing for herself. Isn't that right, Sue?"
She blushed slightly and giggled again. "Yeah, I knew there were men like that, of course, but I've never umm met one before." She looked over at Mary, with a worried expression "I, err, I hope that's ok? Gina said it would be but, you know, I don't want to like offend you?"
Mary smiled broadly, "Don't be silly, dear, I appreciate your concern, but I am not embarrassed about our relationship. To the contrary, proud of it. We love each other dearly but I, and all women, are superior to him. He is submissive, and Gina and I take great pleasure in exposing his preferences, and believe me, dominating him is something which gives all of us pleasure. Sometimes us more than him, of course, but that's how it should be, don't you think?"
Sue laughed at this and took another sip from her glass. "Yes, I guess. That is pretty much what Gina told me, and I'm all for it. It's just kinda strange, though, you know, being as you are husband and wife, mother and father and daughter and all." She looked at Gina and then back at me.
"There you go, panty daddy, no need for shyness", Gina announced. "Sue knows about you. We can all see what you are wearing under those pants and shirt. Take them off. Right here. Now. No need to pretend you're not a little slut. Take those things off and show Sue what you really are."
"Y-yes, Miss Gina. Of course." I was standing pretty much in front of the couch where Gina and Sue were sitting. I looked down at Sue, and then at Gina, and unbuttoned my shirt. The cami I was wearing was a steel blue color, with lace trim, and was fairly tight across my chest. I don't take hormones, so I don't have any kind of breasts, but the fabric and the situation had made my little nipples harden, I could feel them rubbing against the silk as I removed my shirt.
Sue never took her eyes off me as I put the shirt on a chair to the side. Her lips were slightly parted. I looked at Gina and then Mary. They were both alternating between watching me and watching Sue watching me. They were smiling, enjoying the moment. This was something they loved to do. Reaching down, I undid my belt and then my fly. It was always the same when I did this in front of anyone but Mary. Whether, like Gina, they had seen me in panties before, or like Sue, had never seen me, my hands trembled slightly as I opened my pants and lowered them down my legs. If you have never been in this situation, if you don't have the same wiring as people like me, it is almost impossible to explain the crazy mixture of fear, humiliation and sexual excitement of exposing yourself in this way.
The panties were part of a set with the cami, so were matching color and material. The cami had a little bow between my breasts, and the panties had a matching one on the waistband, along with similar lace trim around the waist and legs. The stockings were black sheer thigh highs so I wasn't wearing a suspender belt, although I had several of those, too. My legs. Cock and balls were completely shaved smooth, remarkably on of Gina's immediate ideas when she first learned about me. I could feel my balls tightening and my cock hardening as I placed my slacks with my shirt.
Sue was silent, but still watching me intensely. She had a smile on her lips. Her cheeks were flushed.
"That's better. Come here, slut", Gina instructed.