Check on her

You decide to leave your cock where it is for now. Even though you just came for the third time in a day, you're not hurting yet. No reason to stop the fun. Besides, your cum has made her ass even slipperier and she's moving with ease with each thrust of her ass. You shudder with the sensation, but compose yourself.

You move forward with purpose and barge in on your sister as she hops on your dick and fucks her twat. "Kells, I need---" You start to say and then act horrified. "Holy hell!"

Kelly jumps and her dildo falls out of her. She falls back a bit, her legs still spread, exposing her pussy to you. Her ass, however, continues to pump at your rock hard dick.

"Fucking Christ, bro," Kelly says, angry. "What the fuck are you doing?"

"I-I..." you say, holding out your hand to make it look like you're trying to cover her pussy for your vision. However, of course, you still have a very clear shot of it. "I just had a question."

"Well, I'm busy! Get out!" She keeps her balance with her hands and legs as she still sodomizes herself with your magic dick.

"I can see that," you say. "Any particular reason you're still waving your baby maker at me?"

"I-I... I can't stop fucking..." you see her shake her head and glare at you. "I wouldn't be waving it at you if you weren't in here anyway, so get the fuck out!"

"Fucking?" you ask. You grin at her. "Oh my god, are you playing with a buttplug or something? Do you have something up your ass?"

Your sister blushes hard and glares daggers at you. "I said get out, you brat!"

You start laughing. "And it feels so good to you that you won't even stop writhing in pleasure even in front of your brother?"

You feel her backdoor clench your dick a little and she blushes again. You almost groan in pleasure. She redoubles her efforts of fucking. Interesting. It seems your sister gets off on a little humiliation. In fact, as you watch, you're pretty sure she has a small orgasm in front of you.

You cross your arms, dropping all pretext of "hiding her pussy" and watch her as she bounces. You grin at her.

"God, this is too good," you say.

"Get out, or I'll... I'll..." Her ass clenches harder. You can tell she's close to cumming in front of you.

"Or what? You'll tell mom that you kept fucking yourself in front of me? Do you think she'd really be on your side?"

She groans in frustration but can't stop her movements of pleasuring the dick in her butt no matter how hard she tries.

As you watch, your sister grows more and more ****, trying to hide her building orgasm. She fails, though, and can't help but cum so hard that she squirts a little, moaning and squeezing your dick. You hold back a loud moan as you cum in her ass a second time, even harder than before.

As your sister recovers from her massive orgasm, she pants and yells at you again. "Get the fuck out!"

You laugh as you leave and close the door behind you. This whole encounter has been much hotter than you thought it could be. Obviously, your sister has a few hidden kinks you didn't know about. You'll have to remember that for another time.

But what to do now? Can you handle another orgasm into your sister's ass? Should you give her a break? Is it time for some different fun?