Yes

As Mary disrobes you, you can't help but feel a little guilty that you gave into your rival earlier today and went to second base both ways with her. You also can't shake the feeling that Blue planned this somehow. Fortunately, the guilt falls away with your pants as Mary pushes you back onto the bed and smoothly removes them. Her pants quickly join yours on the floor and then she joins you on the bed, straddling you and pulling your head into her breasts. You waste no time and start suckling on her nipples.

It seems your earlier practice with Blue paid off. Mary clutches your head and pulls you into her bosom while grinding her crotch down against yours. The sensation surprises you. You've never tribed with another woman before, and feeling her pussy pressing into yours is a pleasant experience. You can feel Mary's heat even through the two pairs of underwear that separate your privates, and it isn't long before your underwear is getting wet from both of your juices.

"Oooohh Mary..." You release your grip on her nipples and groan. "That feels so good! Wow, I've never felt this before!" Mary's hips are pressing your wet underwear into your vagina pushing and pulling your inner and outer labia as she goes, the sensations prompt you to start bucking your hips against her more forcefully. It isn't long before her hips draw you to the first orgasm you've experienced with a partner. The feeling is magical.

"Mmm...you're a pleasure to play with, Red." Mary pulls off your panties and then her own, and you notice that both pairs have noticeable wet marks on the crotches. It doesn't take much for her to push you back in your post-orgasm state and you fall back onto the pillows. Your rival's sister lays down on top of you, her large breasts pressing you down into the bed as she starts making out with you while gently massaging your slit with her fingers. You try to return the favor and Mary seems to enjoy it even though you doubt your touch is as practiced as hers. Her touch does a good job of winding you down from your orgasm. The make out session turns into a series of gentle kisses and it isn't long before you drift off to sleep.