I am in a relationship with a lovely girl, thing is she doesnt plan to have sex with me until we are both 20 ((im m15 shes f16)) but im really curious and im just straightup horny all the time, then 2 days ago my female friend (15) texted me and we began texting, one thing lead to another and we began joke flirting, then after all that she said to me that she has had a crush on me ever since we met but has never had the chance cause ive always been with the same girl, i said i had a crush on her too but it was too late, she then told me about a tiktok she saw that asked if its cheating if someone in a relationship fucks a single person just once, no romance included, i knew instantly that she just wanted to fuck and i was all for it, we decided to talk more on the subject until i finally got her to admit that she wanted to fuck, after that we decided to do it at her house when her family were away and we fucked for hours like rabbits, and holy fuck she was divine, it felt like her pussy was sucking my almost 9inch monster cock in, i ended up nutting in her but its fine cuz she was on the pill, after that we continued talking and decided we would keep fucking but keep it strictly non romantical and we wouldnt let my gf find out, im just not sure if its cheating, ive made it very clear to my gf that i wanted sex and she always said not yet, she had her chance, i had mine and i took it. Me and that girl both took each others virginities and i dont regret it, im gonna fuck her again in like 2 hours!