If you are just going down and won't be leaving the bedroom
try places out of the way like Marg's Beach Resort (used to be in the entertainment book too so good discount). Can get a nice townhouse thing with multiple beds cheap. Bring another friend of hers along to share the cost and uhh 'activities'.
Otherwise, rent a house in Duns. Can set up multiple bedrooms with different themes (1 x sleeping room, 1 x dungeon, 1 x school girl outfit room, etc) and also removes the argument (lol) of who will sleep in the wet patch.