Remus has a sexual encounter with Mary MacDonald while struggling with his feelings for Sirius, who continues dating Emmeline Vance. The experience with Mary is pleasant but lacks the emotional intensity he feels with Sirius, confirming his preferences. When Sirius learns about it, he becomes curious and even aroused hearing details, highlighting the complicated nature of their relationship. Their physical connection continues despite Sirius maintaining his relationship with Emmeline, creating emotional confusion for both boys.