Getting the end result of it! Straight guy here and now I know what it’s like, my first time and got a mouthful!

There are so many "surprises," particularly if it's your first time. Just having another man's cock in your mouth is a surprise. It's something you've thought about, dreamed about. And now it's happening. I think the biggest "surprise" is not knowing when your partner is coming. You've been sucking him, and suddenly you become aware that there is "something" in your mouth. It's his sperm. He's starting to cum. And you didn't know. And then his cock pulses and pulses, and your mouth fills with his ejaculate. And yu involuntarily start to swallow. And, then he's orgasmed. And it's over. You've sucked your first cock.

Biggest surprise for me was one evening after a romantic dinner and several drinks I was sitting naked on my wifes chest with my cock in her mouth enjoying the sensations of her soft lips suckling my mushroom head like a hungry infant. I was getting close to orgasm and began to pull out but to my surprise instead of wanting me to withdraw before cumming in her mouth like every time before she clamped down her lips and like a vacuum sucked my cock into her mouth deeper. After attempting to withdraw a few more times and getting the same reaction excitingly I grabbed her pretty head in my hands and began fucking it with reckless abandon thrusting my cock down her throat as far as it would go. It didn't take long before my balls tightened and released ropes of warm sperm into her mouth, and for the fist time EVER, while looking into my eyes, she swallowed every drop!

One of my gay friends who I wanted to play with finally agreed to swap head with me, I started sucking him and he came within a minute. It was kinda surprising but hot, as most other guys took me awhile longer to get there

One recent BJ surprise happened to me recently while getting a blowjob after not having gotten off for a solid three weeks. He'd only been sucking it for a minute or two and then dude was sucking on my nutsack. With one hand, he was holding my boner and idly rubbing my frenulum. I was ready to blow my load just from that. I had to tell him to stop because I didn't want to cum so soon. I probably said "I'm gonna cum!" five times during that blowjob, but her mercifully changed what he was doing each time I said it and somehow I managed to remain on the edge of orgasm for a long time, until I finally exploded deep into the back of his throat. I had never been that close to the edge for that long. Exquisite.