1) Appropriate rhyme for spa 2) Comes after Ooh 3) Contented utterance 4) Exclamation heard in a spa 5) Feels so good 6) Finally, relaxation 7) Hot springs sound 8) It all makes sense now 9) Itch-nailing sound 10) Oh, god, that feels good 11) Opening sound 12) Patient response 13) Patient sound 14) Reaction to a foot rub 1) I see 
Aryl hydrocarbon hydroxylase