Where can we be intimate!?

well, we are together for six months now and we want to have some private time! we're not so young, we're both 17..and we don't want to have sex yet! but we want to make out, cuddle, be able to lye down, relax and enjoy.. we wanted to play 'downtown' but we can't do that in public of course! but, i live with my grandma who is never out of the house, and she is very old fashioned, like, YOU SHOULDN'T HANG OUT WITH GUYS UNTILL YOU'RE LIKE 25!!! so my house, no chance... and he lives with his grandma too, but she's not such a big problem like the ability of his mother walking in on us when she comes from work :/ she never met me, because she doesn't want her son to have a girlfriend cause he has to be hers 24/7 to help around the house!... so pleaaase, we can't keep our relationship on a high level if can't even kiss without being seen from like the whole class... and I don't prefer ''somewhere deep in the forest'' it's never warm enough to lye down on a blanket in the middle of a forest and it's not so secure... HELPPP! :/