how do i ask my crush out

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hello, i am gay and have a problem.
i want to have sex with my friend. imma explain something to you first so you can help me convince him, so stay with me.
we have known each other since kindergarten, so thats a long time. ive always had a thing for him. he was always bigger, we liked each other, he is young (actually 4 months younger than me) but he is already a bear and looking to be a bigger one soon. i saw his erection at gym class, it was big, he smiled at me and hid it. once, we talked about homosexuality and he told us that he had had thoughts about being gay but he then started doubting it. he has given me many signs, for example when he was dressed up as santa for christmas at school, i asked him if hes gonna give me a wooden rod (its a tradition in my country, something like a lump of coal, for bad kids). he responded with "yes, i can give you this one" and did a move pointing at his penis for a second. we just laughed it up but hes done a few of these things in the past too. he kepts saying it was just a joke.
i was almost convinced that he is gay or bi, so last summer, in july, i asked him over snapchat for sex. he responded with why do u wanna fuck? i said that i have had a thing for him for ages and i would like to have sex, i also told him about these signs he has been giving and he said hes not gay and those were jokes.
i did it over snap because if he refused i could just say it was a bet and i dont wanna have sex or anything. he bought it, we remained friends, it stopped being awkward.
well im pretty sure he was just shocked or something and didnt wanna snap me saying yes because i would screenshot it or something. i want to try again, in real life i guess, but i need tips on how to plan it and how to investigate a bit more that hes gay curious. he has never had a girlfriend btw.