Hi Hailey, to much pressure on him and anxiety with his parents down below, just give him some time dont pressure him for sex for a couple of days, then go somewhere qutie and then see how things go, I will lay odds he will be up you like a rat up a pipe.
Good Luck
That is very normal. When I was 19 I did that 3 days in a row with my gf. She thought it was her but it was me I just went soft. Next day everything went well. It's just one of those things
If this is not a common thing and only occurred this once, I wouldn't worry. As you stated, his parents were downstairs. He knew that. He probably also knows if his bed squeaks loudly enough for it to be heard downstairs or his parents' feelings about him having sex in their house and the potential consequences regardless of his age. I seriously wouldn't worry. Having someone else present in the house really kills the mood for many people regardless of how much they want it.