Reach down and play

You reach down inside their swimsuit, heading towards their nipples. Samantha instantly clenches her shoulder and pulls away, but Heather removes her lips from your balls and says, "It's only fair Samantha lets him in."

Samantha obeys her mother and leans in, allowing your hand to slip inside the neckline of her one piece and allowing her mouth to once again take your dick in.

You quickly find Samantha's nipples perched on top of her tits while your other hand has to work a little harder to climb to the top of her mother's tits. But once on top, your hands begin to work both of their sensitive hard nipples, causing them to moan into your groin.