Patiently Waiting in The Nitty Gritty

My sister in law is staying with us for awhile which is a sometimes nice sometimes just strange situation. I'm happy to have her here but I feel like I'm waiting for her to go home to get laid. I know that is not the real reason. We have late nights or I have to go to grad school and we are tired/busy. I also feel like there is a bit of awkwardness in having sex in a one bedroom apartment with someone sleeping in the living room. No biggie I guess. I'm just not used to having to wait so long. Not used to having someone else here.