When Alan and his assistant, Melissa, share a few kisses at his office Alan puts a stop to it right away, insisting that they keep things professional. Once back at home Alan can't stop obsessing over Melissa, so he throws caution to the wind and surprises Melissa at her house. However, once there he finds that her live-in, pot smoking mother makes hooking up with her next to impossible. Meanwhile, when Jake and Charlie are invited over to dinner at a hot twenty-something's house they end up battling it out for her affection.