"Oh ho, look at that," Ali exclaims, "Looks like you're going down my tank top!"
With her free hand, Ali proceeds to effortless slip out of her tank top, leaving her solely in her bra. Your face (and some other part of your body) goes beet red as the blood begins to flow in response to the unobstructed view of her massive bust. Her breasts fight valiantly against the tight hold of her brassiere, giving them a perfect shape.
"Hehe, like what you see?" Ali jokes while her free hand playfully gropes a tit.
"S-sorry," you stammer.
"They're just tits, don't be so bashful."
It wasn't the first time Ali had been so nonchalant about her body. It was one of the many things that gave you the impression that she has a mad crush on you.
Your musings about her feelings would have to wait, though, as Ali picks up Katie from her palm, dangling her by the strap of her bra. She kicks and screams, but nothing can be done as she is gradually brought to Ali's left breast. Ali uses her other hand to pinch the edge of the cup and pulls it out, creating a small gap between the fabric and her breast.
"Take a good look at your new home, Katie!" Ali taunts as she release your step sister. Katie tumbles down, sliding right in the crevice. She slides down Ali's smooth breast skin, coming to a stop as she collides with the nipple. Giggling, Ali lets go of the edge, causing the cup to snap back to its old position. You notice a vaguely human shaped hump in the center of Ali's right breast, the only indication of your step-sister's imprisonment.
"Well, that takes care of that," Ali says, strolling up to you. She runs her hand against your pants, feeling the stiff rod in your pants.
"Looks like we both enjoyed it, didn't we?"
"Y-yeah, I guess we did," you admit.
"Still feeling awkward? Don't be,". She grabs your hand and brings it to the breast holding Ali. She forces you to grope her soft, fleshy chest. It feels amazing, more so by the squirming sensation that you notice whenever you run you hand over the lump.
"Come on," she whispers into your ear, "Let's...