How can I help my boyfriend with his erection

Maybe he just needs his confidence building... Maybe ask him if its ok when your kissing to touch it over his trousers..... Then maybe once he is comfortable with that go to.. Over underwear and then just naturally progress.. Mayyyybe see if he feels confident showing you a picture of it... Or another idea is to explore in a completely darkened room ... Then he will get more confident with you Touching... Tasting etc and slowling introduce light :-) hope this helps :-)