When i had sex with my mothers friend son

I was 14 or 15 and my mom went to her friends house alot and I talk to her son alot and I had to stay over so I had to sleep with her son I went to go take a shower and when I step out and went into his room he was naked I nowhere else to get dressed so I droped my towel and I already had boobs and then when the towel went to the ground he saw every thing and he was 15 but when I got dressed and went to bed it was hard to sleep so I asked him if he was sleepy he said no so I said″lets have sex″and he said yes then it went on all night I loved it now every time I see him we have sex and at 16 we started dating now he is my boyfriend is this normal