ejaculate in his ear while hes sleeping, imagine how hard that would be to get out, and your hearing would be messed up for a while.  It would be hilarious to see his reaction, hed bring his hands to his ear, get a bug goopy handful, smell it and do a double take, when he realises what it is, hell rush to the sink.  I will send someone 5 bucks if they cum in someones ear and film the reaction