Just saw my sister in law nude on the shower…

I actually just saw my sister in law in nude in the shower. Shes a couple years younger than my wife and hasn’t had any kids so she’s fit, toned and pert. We’re currently staying with her and some other family for a couple weeks. On the second day I saw her in her sheer sleep t-shirt which didn’t hide her boobs much but today I actually saw her fully nude! Anyone else had a similar experience or are you the sexy sister in law…