I was 20 then (small and thin like a 162-45 chick), when a colleague (he was over 40) invited me to his place while his wife went to the dacha, I suspected that they wanted to fuck me, but I was not sure, there were jokes and hints about it. I really wanted to be a "girl" for a man, but he was hesitant. I asked to go to the bathroom and stripped naked. I didn't know how the man would react, so I was really scared, but I went out to the kitchen in my birthday suit and, burning with shame, asked, "Do you want me to suck you off?" He took off his pants and said, "Go ahead, suck." I walked over, knelt down, took his penis in my hand, and it immediately began to grow and harden. I leaned over, grabbed the head with my lips, and started sucking for the first time. Seeing a penis in front of my face, smelling it, and realizing that you were on your knees sucking a dick was humiliating, but I liked it and it made my dick hard, so I wanted to go all the way. Already on the bed, the man fucked me while holding my ass in his hands. His penis was big, it was painful, but pleasant, and I endured it. The pain then went away, and riding in the cowgirl position, I ejaculated uncontrollably. I asked him to cum in my mouth, I decided that the man would be pleased if I swallowed the sperm and licked his penis and balls clean.