So I hooked up with my brothers girlfriend [MF]

Okay! So you can judge me all you want and I’ve had lots of regrets about this everyday. Contemplated a million times about telling my brother and finally decided to take it to the grave.
This is about a year back. My brother was out of town for over a week. His girlfriend [26f] was all by herself at their place since a few days. She didn’t have many friends so was rather alone most of the times. I [24m] was like an identical copy of my brother’s. We used to double date often and later on I came to know that she’d always had the hots for me since a long time. So this was one of the days when she asked me to get weed for her. I obligingly did and she invited me in to smoke a joint. Mind you, I had got her weed a lot of times but this was the first time we smoke up together. We fired up a joint and we’re pretty stoned in about half an hour. Casually giggling about stuff and she started eyeing me weird. Out of the blue, she shook her head and asked me to leave. I felt it was rather rude and left. Later she texted me that she was sorry and had really weird thoughts. I told her it was okay. She asked me if I wanted to come over again and down some wine. I was a junkie and was there soon. This time we sat in her bedroom drinking in the dim lights. The music and mood built up and I looked at her and she was already searching my face. Her lips were really kissable. I slowly leaned towards her and so did she. And damn! We had one of the hottest kiss ever. It was like fire on ice. Her tongue rolling into my mouth, mine running down her neck. I was lifting her top when out of the blue she said, “no, no, no we shouldn’t. Stop!!” And like a reflex I zapped out and reality crashed on me. I was so hard and hardly could think with my head then. Picked up my jacket and left.
That night I had blue balls and didn’t jerk off. A little testicular torsion and my balls hurt like hell. I texted her this and she said she was really sorry. We went for coffee the next day. The air was really charged. Not only were we two really attractive individuals, the taboo about the whole thing made it kinky as hell.
We went to her place that evening to have some more wine. Our intentions were really straight. She put on some music and we were dancing to slow jazz. I put my hands on her waist and pulled her closer. We were kissing with the same energy as the previous night. It was like picking up where we left. She pushed me on the bed and was on top of me. I was licking and her neck and she moaned for me to bite into her. It was such a turn on. Her skin felt like milk, so supple and creamy dreamy. I took off her top and she had a brilliant red bra on, holding two really soft huge milky boobs. With me kissing down her neck, I unhooked her bra with one hand. That really turned her on. The bra was floored and I held her tits in my hands. I’ve had my fair share of girls and boobs but never have I ever had boobs that jiggled in my palms. The kind that is so soft it might just melt in your hands. I ravished them. Suck on the nipples, bit into them. Licked the side boobs. Oh she was so turned on. She jumped off the bed, pulled me up and put me in a chair. Kissing me, she unbuckled and pull down my pants. Before I knew she had grabbed my cock and put it in her mouth. It was her show now!! I watched her as she bobbed up and down on my dick, licking it, sucking it with relish. I would’ve pushed her head down and made her rim my ass (like my gf did) but being the first time, I didn’t know how she’d react (which later on I found out, she was too much into). She took my hand and took me to the kitchen, mounted the stand and spread her legs. Usually I’m not much of a giver in sex, but that night I had some of my best moves on display. I fucked her brains out. She later told me that I fucked like a pornstar! She came on the stand and then later kneeled down before me and tasted herself again. All the while dirty talking me, asking me to cum on her face. I didn’t, couldn’t. I took her to the bed and fucked her missionary, she came again. And I still couldn’t. We were both spent and I lay down next to her and jerked off and came in a minute blowing 3 week’s worth of semen on her belly. She dipped a finger and put it in her mouth.