Is it normal that i want to give my married best friend his first blow job?

im a guy....I was recently talking with my best friend about sex and stuff and he made the comment that he has never had a blow job. He and his wife got married at a pretty young age and both of them had never had sex. I won't deny that I have sexual feelings for him, which is strange, because I consider myself to be straight, and have only had feelings for a few other males. I could never persue anything with him but all I can think about is making him cum in my mouth...
It would be my first male encounter and his first blow job. That can't be normal

I'd like to add that we r very close and talk about sex a lot but never talk about anything other than girls. We have strong feelings for each other as friends.