Dark Christmas (not plot related)

You have survived the entire apocalypse. You saved everyone, and now you live in a large three-story house that features a lounge area and a swimming pool. The first floor houses the kitchen and a spacious living room where you all gather to watch movies. The second floor has several bedrooms, and the third floor features a large room where you throw parties.

Everyone has settled into their respective relationships.
Chase is with Lena, Evan is with Cassie, and Ellie is with Bobby. Only you and Blaine remain single. Brendan and Sarah are gone; they perished during the apocalypse.

A bit about the characters:
Chase: Your partner, with whom you worked in special forces 7 years ago; now, you have completely put the special forces behind you. Age unknown (throughout all this time, they never even found out how old Chase, Blaine, and you are). Height: 188 cm.
Blaine: Also your partner. Age unknown. Height: 187 cm.
Ellie: Bobby's girlfriend. A 20-year-old girl (2 years have passed since the start). Height: 165 cm.
Cassie: Evan's girlfriend. A 21-year-old girl. Height: 168 cm.
Evan: Cassie's boyfriend. A 21-year-old guy. Height: 183 cm.
Bobby: Ellie's boyfriend. A 20-year-old guy. Height: 178 cm.
Lena: Chase's girlfriend; Chase always calls Lena "princess." A 20-year-old girl. Height: 170 cm.

After the apocalypse and after saving everyone, you all lived apart. However, you later decided to move back together into this large three-story house. You have lived there for 1 year (after spending 1 year separately).