It wasn’t when I told him I loved him back that first time. It was four months in, we were lying in bed, naked. He was sleeping, and I was hugging him. I was stroking his back, and I could hear his breath. Then, I started sobbing (I’m that cheesy) because that moment felt perfect. Everything fit, and I was in love.
Postscript: I didn’t feel I loved him back that first time because I hadn’t taken his virginity, yet. After those 4 months, I had. Multiple times.