Spermy Panties

My sister is staying with my wife and me while she visits for a few weeks.

I've always had a thing for her. Obviously, I could never act on it, but when I learned to masturbate I did steal her panties from the hamper and sniff them.

Having her under the same roof has aroused my old emotions and longings. Yesterday I took a pair of her panties. I told my wife and my sister I was going to work on a project in the basement. In a half hour I shot 4 huge loads of cum on my sister's panties.

Now I don't know what to do. If I put them back she'll notice the stains, and the scent of semen. There's no other male in the house, so she'll know I ejaculated on her panties.

I guess I could say they accidentally got mixed with our laundry, and bring them to her washed. She might also get suspicious in that case. because the panties had been in her gym bag and were nowhere near mine and my wife's laundry pile.

Maybe keeping the panties is best. I shouldn't have nutted on them in that case, because her smell will weaken when I have to wash them.

I just have no self-control around my sister. My wife noticed last night how aggressive I was in bed. Thank God she didn't connect that change with our guest. As I came inside my wife (we're trying for a baby), I was imagining she was my sister instead.