I think its not love... You cant love someone just after sex... no way!!! I was in love 2 times in my life - the second time I was with my girlfriend for about 1.5 year and after that I recognize that I wasn't in full love - it was just slightly. In your position I think you are just fascinated about this guy... hmm I dont know how to put it in words
Love is something that must be building by 2 people and this process take long time... and im sure about it
Try your best maybe someday you will call this love with no hesitation
Gambatte