One Bed, Two In-Laws

Parker (Phil's counterpart) checks into the hotel for the wedding getaway. His spouse won't show up until the following day, but her sister, Kylie (Laura's role), is already on site. With the hotel fully booked, they end up in a single room featuring just one bed.
Parker expresses discomfort about bedding down with his wife's relative, yet Kylie reassures him it's no problem at all. They opt to share the bed temporarily, hoping to secure a different setup the next day. As they settle in, Kylie playfully exposes her alluring underwear and curvaceous rear, sparking Parker's arousal.
Though he's initially reluctant, he eventually consents to a secretive, intense sexual encounter, where they indulge in fervent thrusting and passionate moans, keeping their taboo liaison under wraps.