Tied and whipped

I have a friend with whom I talk a lot about wanking, masturbating, and all the things that excite us. One occasion we were at his apartment talking about these topics when suddenly he handcuffed me to the chair with my hands behind my back, lifted my shirt and passed it over my head. It was very fast and I didn't notice, then he gagged me with tape, wrapping it several times around my mouth, I tried to say something but only moans came out. He took off my shoes, socks, and pants, leaving only my boxer shorts on; he started telling me to calm down, that he just wanted to wank, that he had been wanting to have me like this for a long time. I tried to free myself but it was impossible, the handcuffs were well put and I didn't have much room to move. My friend started caressing me slowly, I couldn't help myself, I let go, there was nothing else I could do. My erection began to show above my boxer shorts, my friend noticed but didn't take it off yet. He started caressing my penis slowly, over the fabric of my boxer shorts, my moans didn't have to wait, through my gagging I groaned more and more. Never had anyone tied me up and wanked me before, I was enjoying the moment; his finger drew the outline of my erect penis with slowness. After that my friend took off my boxer shorts slowly, finally my free and erect penis. With the tip of his finger he started caressing the head of my penis, slow and very slow, making it redder and wetter. Then he started wanking me, mhhhhh, I didn't want him to stop, I closed my eyes and let myself go. There I was, naked, handcuffed and gagged, being wanked by my friend. He wanked me in several ways, at a point on my penis precum started coming out, and he lubricated my anus, increasing the pleasure. I started groaning louder, it was my way of warning him that I was going to come; fortunately he understood, so he left me still for a few minutes to take a breath. I wasn't going to resist any longer, so when he went back to wanking me again I groaned hard, and this time I ejaculated, my semen shot out in spurts and fell on my chest and stomach. At that moment, my friend left my penis free, while I was moving on the chair, letting myself be carried away by my passion. After that explosion, a few drops of semen were still coming out from the head of my penis, and my friend picked them up with his fingers and rubbed them on my nipples. With a towel, he cleaned up the remaining semen from my penis, doing it slowly while I was taking deep breaths. Then he untied me and took off the strap, what a delicious masturbation she gave me, I wanted to get revenge, and when I got the chance, I did, but that's another story for later.