My friend's older sister has huge tits. She has a cute face and a great body. Every time I visit my friend's house, I see her doing exercises for her beauty. Her outfit during those times is just too erotic. On top, she wears what's basically a bra that completely reveals her cleavage, and on the bottom, it's basically panties that almost show her ass and are just a tiny bit away from revealing her pussy. On top of that, because the color is gray, the sweat that seeps out from her working so hard soaks in clearly, making it visually obvious. Unable to hold back, I went straight for insertion. Surprisingly, she accepted me... Starting secret orgasm training with sexercise hidden from my friend.