just 16-hr old daughter male just 'friend' (15) stayed over. heard her go into his room early morning and went to check was in his bed both just lying quietly. he lost a parent recently, she has a medical condition which causes her worries she can't talk to many friends about. might they just be seeking comfort from each other or should I listen to my instincts?! would rather they were here if getting close than elsewhere; don't want to stop them giving each other comfort but also need to provide boundaries if this relationship is to continue or develop - any advice?