Rule of Three

Harper's eyes meet Grant's across a crowded bookshelf and ever the fast worker, she walks away with his phone number and the likelihood of a date. Back home, her live-in boyfriend Jay is intrigued. His relationship with Harper doesn't stick to the usual rules but he always recommends caution when inviting someone else to 'play' Jay and Grant's first meeting could go better, though. They're both nearly naked and Jay has to muster all the charm he can to bring Grant back into the fold. Rules? Who needs them?