As some of you may know, I have been in a sexual relationship with my adult middle daughter for about 2 years, starting when my wife's medical condition caused her to not want sex anymore. I have also started a relationship with my adult granddaughter (see Grandpa to the Rescue). I got a call on the Thursday before Father's Day from Patty saying they couldn't come on Sunday as they were going to her husband's family. No problem, I like her in-laws. She said she would see me on Friday with my present. Friday arrived and when I opened the front door, I was surprised to see she had her older sister Tina with her.
I say surprised because since I was home alone, I was expecting to be able to have Patty in bed for awhile. The look on my face must have showed what I was thinking. Both girls smiled and said, "Happy Father's Day, Dad! We're your present!" I looked at Patty who told me that Tina had found out what we were doing when she stopped by Patty's one afternoon when I was there. When the door was locked and seeing both cars in the drive, she had peeked through a gap in the drapes of the bedroom window and saw us together. Tina said it shocked and excited her at the same time. When she confronted Patty about it, Patty explained that she would rather help me by having sex with me than having me cheat on their Mom with someone else.
Tina then told me that instead of being mad about it, she was actually a little jealous of Patty and she wanted in on the fun, too. She had just separated from her husband and she was feeling lonely and horny. She knew I wouldn't do anything to hurt her. At this point, I should probably describe us. Tina is in her early 40's, 5'5", 135 lbs with 32B tits, shaved pussy and lips that are made to kiss and suck dick. Patty is 2 years younger, 5'7", 140 lbs, 34C boobs and a trimmed pussy. I am in my mid 60's, 5'8", 170 lbs, 7" cock when hard, with a slight downward curve.
I looked again at both girls and asked Tina if she was sure about doing this. She answered that she was very sure and showed me by coming closer and kissing me deeply on the lips. Wrapping her arm around me, she pressed her body against mine so tightly, I could feel her breasts against my chest. She pushed her tongue into my mouth to duel with my tongue. When we broke the kiss, she asked me if I had any doubts. I didn't as the bulge in my pants proved the point. Patty came to me and said it was her turn and planted her lips on mine and putting her hand on my crotch to rub my erection to further hardness.