Me & My best friend

ok so. The other day me and my best friend were hanging out and as we were watching TV he leans in and tells me he wants to kiss me. so I kinda am just like okay then just kiss me. so we start kissing and making out and things get nice and steamy. so then he's like hey you want to go to my room and I say yes. I follow him to his room and well we start to take each others clothing off and as we are about to start having sex. my phone rings and I have to go home to take care of my sister. so I get dressed and leave.