You try to tell her how it is normal for a guy to have an erection looking at a beautiful half-naked girl

You try to tell her how it is normal for a guy to have an erection looking at a beautifull naked girl. She replys: "Beautiful? Are you getting aroused by your sister? Tell me, what would you do to have me?" Saying this she took her foot back and you catched Mike giving you a **** stare and you were getting the reason why, your sister's feet are small and delightfull to look at and he was enjoing the moment. While thinking about all this you forgot that your sister asked you a question, so she reminded you with a kick right between your legs, it wasn't very hard, and you were daydreaming so you barely feel it but pretend you are really hurt to not recive any more damage.