M22 since I started HS my little sister of 3 1/2 years best friend has had a massive crush on me. When we were younger it was innocent but the older she got the more sexual her passes/advances began. I always brushed it off bc that’s my sister’s closest friend and the age gap, but her friend turned 18 in June. In July I saw her at my parents house were just talking and till then I never noticed how much she filled out always had a cute face but for a small girl she had great tits and a solid ass. She claimed to be a virgin since the only person she had sex with had a small dick and says she’s be waiting on me the whole time. I flirt back with her and give her my new #. We text for less than a week before she ask can she come see me. I replied “to do what”, and she said “whatever you want”. A she wasn’t kidding our first time having sex she obeyed all of my orders and let me cum in her mouth, and apologizes for not swallowing it all. There’s more but that’s the jist of it. I feel bad about the whole thing like I’m taking advantage what do y’all think?