Friend touches my d*ck

Hello! I've a question about one friend who is touching my dck I'll explain so you can tell me if he's gay and he wants to be my bf. Everyday while we're hanging we're talking, playing, joking, kidding and etc. he is touching with his hand my dck and after his d*ck (maybe to show me that he's getting hard. So I wanna be his boyfriend he's cute, but how I'll start this? I am afraid If I touch him back will he be angry, if he's just joking? He's doing it always not everyday, but he's doing it when we're alone and seeing each other. I really like him..Give me some advice. Thanks in advance! :)