No, you'll have to choose. But this only affects the party scene. You can continue the character's route regardless of what happened at the party.
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ok ... i thought there will be a way to get them both because when i do the skipping there's an option which both of them were slept in the party and had a movie with Kyle? And how about Clare's Gallery (Adam)? i tried so hard but yet to get it.. and also who is Layla? I couldn't find this character all over the map XD