When my sister brought her friends to our house, it was a cold day so everyone gathered around the kotatsu doing homework. So I casually peeked inside. The inside of the kotatsu was a paradise of panty shots from my sister's friends! As I pretended to sleep and got excited watching the panty shots, I got an erection! When I thought 'shit,' one of my sister's friends seemed turned on by the erection and started secretly touching it without my sister noticing. And then she said something like 'Touch me too'…
