Remus’ stomach lurches a bit at the thought of Sirius coming into his room and seeing Remus there, passed out in his bed, when there is a perfectly empty and unused bed just across the hall; and it rolls at the thought of Sirius bringing the potion up, either as a gesture of goodwill or a sign that he wants Remus out and lucid as soon as possible. Remus is inclined to think it the latter, and he downs the potion before he can dwell on it long enough to be sick.