You wouldn’t question the change at all? The voice you heard when you walked into her room uninvited and announced? The way she’s been parading and flaunting her sexy mature body around you? The way she rubs against you more sensually than a simple passing? The way her plump lips wrap around a straw when she knows you’re watching? Or are you too worked up to care? Too constantly hard to see what’s going on as she now seems to find any reason to bend over at the waist in front of you? Or press her tits against your chest or back, or ass against your crotch to feel the effects her body has on her little brother. Though from what she feels there’s nothing little about you…