TIFU by fooling around with my girlfriend thinking our friend was asleep

So a few days ago my girlfriend, best friend and I thought it would be a good idea to spend the day together and then stay over at my girlfriend's house. so we get back all tired and we're all sleeping in the same room on the floor, we put on some netflix but our friend says he'll probably be asleep within 10 minutes. 10 minutes pass and he hasn't moved in a while, hasn't talked and is fully under the blankets. My girlfriend and I kiss goodnight but things escalate quickly because we're risktakers...

anyway we basically start "playing" until we're both done, and then a few minutes later our friend gets up and goes to the toilet without saying a word. he comes back and clearly knows something is up and generally gives us the side-eye. then he says, "I couldn't sleep".

TLDR: my gf and i thought our friend was asleep while we have each other handjobs