The Melancholy of Haruhi Suzumiya, Vol. 4 (Manga)

Trapped on the snowy mountain by both a storm and the supernatural forces that have cut off Yuki from the Data Overmind, Kyon is slowly roused from sleep by Asahina slowly unbuttoning her nightshirt as she climbs into his bed. Knowing that it's not real,he must find a means of escape before it's too late.