i need help...

so when i get on my period, i always get horny. there's this guy that is not related to me but he's a family friend. last year during 2017, we were laying on the couch together, everyone left the room, and i just feel a hand start rubbing up my chest all the way to my tits. he starts rubbing and grabbing them, he messes with my nipples and God i got so wet. maybe a few months later, we were laying in the bed but his cousins were also there, they were playing a game and he just strts rubbing his hand on my tits again, i look at him like "they're are children right there" and he didn't care, this time after he pinched my nipples, he started sucking on them, he kept flicking his tongue and i got so horny. both of the times, i was on my period. yesterday i wore shorts and he couldn't stop staring at my ass. because of him doing that to me, for the past week i had been having dreams about him putting me in handcuffs and pounding me. i was driving and i started day dreaming, i was day dreaming about him choking me against the wall while his other hand was rubbing my clit and fingering me. i of course started swerving off the road but i caught myself before anything happened. does anyone know what i can do because ever since then i have been really horny and its hard to get over it. yes i have tried masturbation, i think i just need some kinky stuff to happen, but i can't which is the problem. plus right now I'm on my period and it sucks cause I'm super horny. does anyone know what i can do? and i also don't want to tell him straight up...