There is really is such thing as a bad blowjob and here are signs that you are not good at giving head.
He falls asleep
This is a very bad sign and you spank yourself if you can. Especially if he is pretending to fall asleep so you can stop
He pushes you aside
Totally shameful
He says “ouch” on more than one occasion.
This is a mouth action that does not require you to use your teeth. You need to stop.
He asks if you’re a virgin
This is also another way of saying “have you been living under a rock” Definitely not a compliment
He watches Porn
That is saying i really don’t need you or you are not doing enough
You don’t enjoy what you are doing
Enthusiasm is quite important whilst giving a blowjob
He gives constant instructions
You need to understand what he likes and do those things
Giving a blowjob isn’t rocket science really. Also don’t feel the need to swallow anything.