I'll bet that once that young black cock was buried in your ass it didn't take much to keep you on it.
wouldn't you feel ashamed, i mean, you being 18, and said shortly after the bus pulled out you were sitting on this 15 year old black kids dick. i didn't read where he made you do that, it sounds like you willingly just got on it. you said it felt good, and he kept it in you the whole trip, you had to know he was going to cum in you, and you stated that he did, so you knew you'd got fucked.
He may have been 3 years younger, but it sounds like he knew to take care of your hot white ass, and I'll bet when you got off his cock he wasn't feeling any kind of embarrassed.
I love it when a younger kid, especally a black one fucks an older white kid, makes him have more respect.
When I was in highschool I did the same thing on the bus many times. I'd catch the driver looking in the mirror and figured he knew what was going on, but I really didn't care.
Once you're on a dick like that its kinda hard to get off of it, especially if he don't want you to. If you make much fuss about it, it just attracts attention, neither wants that, and he got you on it, so he wants to got for a home run weather you want it or not.
#6 has it right, once you get settled down on that thing you are his, I found that out the first time it happened, he went for a home run twice.
In the back seat and dark like that and he's nuts deep the excitement of getting caught is what keeps you on that dick. Then when he decides to lean back, hold you up and really stick it to you, you really don't think about anything other that what he's doing.
I agree completely with #8, my first time was at the local theater, back row and all, but the place was at least half full. But once I gave in and settled down on it, who I was with and how many people were there didn't matter.