Secrets, Lies and Guinness Pies

In response to the constant needling he suffers from the resident females of Number 12 to offer insight and maturity in the darkest of times, Remus Lupin handles Harry's grieving in the most insightful and mature way he can: by taking him out and getting him utterly plastered. However, obscene alcoholic consumption and singing along to 'Surfer Rosa' in ones' underwear is NOT coping with your mourning, as explained by one particularly mercurial young auror, and Remus Lupin is forced to confront the facts of life.

Waking up drunk and naked next to a younger woman, Remus Lupin is forced to confront his immaturity and grieving for Sirius when he realises how selfish he has been.