Eva and Kat lead a relaxed life on their houseboat along a canal in London. However, the passing of their pet rekindles Eva’s desire to become a mother, while Kat is simply interested in getting another cat. The situation takes a turn when Kat’s close friend, Roger, comes to visit from Barcelona. In a tipsy moment, they agree that Roger could be the sperm donor for Eva. This decision raises questions about the impact on the lesbian couple, the biological father, the child, and the dynamics of their relationships.