Reconsidering her position, Shelly decided to move upstairs before her sister came home. She didn’t know if she’d be able to face her sister knowing what she had just done with her boyfriend.
Sure enough, as soon as Chrissy was home and realised that Alex was in the house, she was in the living room and all over him. They kissed passionately and Chrissy’s hands were excitedly exploring his body, bringing a response from Alex that he feared that he may not have been able to make after the day’s exploits. After the last couple of days, Chrissy was horny as hell and looking for release and ravaged Alex accordingly, pressing her tits against him, grabbing at his cock, tugging and stroking it through his pants.
Alex responded to her desire, groping Chrissy’s breasts, pulling at them with one hand, the other seeking its way under her skirt. He found that she was wearing a thong and his fingers quickly worked it aside, seeking the wet warmth of her pussy. Chrissy stopped to unbutton her blouse, exposing her bra clad breasts. Alex sucked at a nipple through the material of the bra and Chrissy moaned in delight, feeling the warmth seep through her bra as Alex’s fingers began their exploration of her pussy at the same time. She squirmed on his fingers, loving the penetration and attention her pussy flooding with juices in response to her desire. Her fingers worked at his shorts, drawing his cock from them, freeing it to be grasped in her hands. She repositioned herself so that she could suck on his cock, hungry to feel the dichotomy of the smooth skin and stiff shaft within her mouth.
Alex lay back as Chrissy sucked up and down the length of his engorged cock. As he lay his head back, he was stunned to notice Sherry standing on the stairs, watching. It was all he could do not to pull out of Chrissy’s mouth, but he didn’t want her to know what was going on and was afraid that it could lead to her finding out about what he and Shelly and Cheryl had been doing. So he relaxed, and watched Shelly as her sister bobbed up and down on his cock.
Shelly watched, fascinated by the pleasure that was flooding through her at watching her sister blow Alex. She was unsure of what to do. She had come down stairs thinking about getting some dinner and was surprised when she had found out what was going on. But She was captivated as well. Then Alex had looked up and rather than stopping as she would have expected, he had smiled and was now looking her in the eye as his cock was sucked. She was exhilarated. This was different from when she had shared him with Cheryl. It was more exciting because Chrissy was oblivious to what was going on.
Chrissy was still only wearing a towel, and as her sister sucked off her boyfriend, she slipped a hand inside it to fondle her breast and pinch her nipple. Alex licked his lips at her and she decided that she would risk a little more, allowing the towel to fall to the floor. She stood there, naked, rubbing her body, touching her breasts, rubbing her bald mound. Alex took Chrissy’s head in his hands, moving her head up and down on his cock. He winked at Shelly and told Chrissy that he wanted to eat her now, that he wanted to taster her wet pussy, split her with his tongue and suck on her clit until she came.
“Oh god yes, do it to me,” encouraged Chrissy. Shelly ducked down on the stairway out of sight as they changed positions. She lay there, listening as Alex commenced eating out her sister. Chrissy began to moan as her clit was assaulted by Alex’s tongue. Shelly was going wild listening to it, wanting to see her sister in the throes of her passion. She knelt on the stairs, peeking over the banister, one hand supporting her weight, the other stroking her clit. She could see her sister laid out on the couch, eyes closed in ecstasy, hands grasping at her breasts, rubbing her tummy, running through Alex’s hair. Then she looked up, Straight at Shelly. She flinched, but managed to hide it as a reaction to what Alex was doing with her pussy.
Shelly thought that the game was up for sure now, but once again was surprised when nothing happened. Chrissy too seemed to take enjoyment from the fact that her little sister was watching her be pleasured by her lover. Daringly, Shelly stood, showing off her body to her sister. Touching herself all over as she had for Alex just moments before. Now, armed with the knowledge that both Alex and Chrissy were happy to be watched (even if they weren’t aware of the other’s interest and involvement) Shelly moved slowly down the stairs and Chrissy’s moaning began anew, emboldening Shelly still further, advancing to stand just a couple of feet away, running her hands over her body, sliding a finger between her pussy lips and sucking on it as her sister watched with her boyfriend working on her clit.
Shelly stood there, horny as hell, not quite sure how to take the next step that she really wanted to take. Chrissy was staring at her, an invitation in her eye. Shelly was frozen in indecision … did she go first to Chrissy or did she just reach in and grab Alex’s cock from behind. She decided that she would be better off surprising Alex with her incestuous relationship with her sister than with the fact that she was comfortable with Alex’s cock to her sister.
Quietly, whilst Alex was still busy sucking and licking at Chrissy’s clit, Shelly walked around the couch to where her sister lay. She knelt down and started to kiss her. Alex, sensing the movement and a change in what was happening, looked up and was stunned. He lay there between his girlfriend’s legs watching as she tangled tongues with her own sister. They broke apart long enough for Chrissy to tell him to keep going, to make her cum. Then she was again kissing her sister deeply, only now, Shelly had her hands on Chrissy’s breasts, rubbing and feeling them, pulling and pinching the nipples. He dipped his tongue into Chrissy’s pussy, then ran up the slit to her clit where he circled it slowly, eyes fixed and focussed on the action that was happening above him.
