My sister-in-law is driving me crazy!!

Hello people today I want to tell you something that happened on Saturday.....we went out to eat with the family at my brother's place....I've already told this story here about how crazy my sister-in-law is....a beautiful Paraguayan woman with black hair, fair skin, and a nice view from any angle. Obviously, I'm not going to put up pictures of her and nor do I want to get into trouble because it could be a huge mess and I don't know if she's cool with me, it would be a bad move and above all she's my brother's wife... But the fantasy is real and I've already told you that the last time my wife came home wearing Carolina's (my sister-in-law) short and I gave myself a masturbation to leave the short with my cum and fantasize that next time I see my sister-in-law in that short, I'll know my cum is near that divine ass. Now what happened was that on Saturday we got together to eat pizzas and it turned out Carolina had just gotten back from work and went to take a bath...she came out wearing a top without a bra and with the famous shorty.....naaaaa almost exploded in my pants and I grabbed onto something, said this is mine.....I went to the bathroom to find the clothes she had taken off and found the treasure I was looking for......her thong!!!! It was very small, black, and beautiful and it was all wet from Carolina's sweat...You can imagine the smell that hit me.....that fragrance of ass, pussy, and sweat got me drunk and I couldn't help myself, I gave myself a furious masturbation......with the thong stuck to my nose, letting my imagination run wild, I imagined her in four with that thong well inserted in ass, sucking my cock. When I was about to cum, someone knocked on the bathroom door...it was my wife who wanted to know if I was okay, I lied, don't remember what excuse, just wanted to cum...Minutes later after the interruption I could cum and did it over the thong!!!! Left it full of cum. Something that quickly dawned on me was that it was a mistake !!!! Because it wasn't like she had washed it hanging in the shower, it was under her clothes thrown away in the bathroom, so I couldn't wash it either To hide. So I said...whatever God wills and thus, full of cum, I left her again where I had found her, total in a bit the cum dries up and nothing happens here..... I washed my hands and went out as if nothing happened. A bit later.... Carolina says 'leave the dirty laundry in the bathroom!' And she got up facing towards the bathroom. I couldn't stop thinking...here it comes, she'll face me and ahead of everyone will tell that I jerked off thinking about her, but luckily she didn't do it. But it seemed to me that when coming out of the bathroom she smelled her hands and touched them as if wanting to find out what had soiled them.. Unfortunately, I couldn't take a picture of the thong to keep going with more jerks.... But now my head is spinning knowing that she touched my cum-soaked thong...