The fear you felt, was it the old normal fear or was it different? Were you afraid of what had actually happened? The fear of the unknown? You have just discovered a new path with regards to physical intimacy. What you experienced was "Making Love". The fact you felt good the next day proves you are on the right track. You and your mind are now differentiating between "having sex" and "Making Love". The buildup, the flow of love and sensuality is what lead you to it. Now do it again. Follow the same formula you did on vacation. Plan a day where you streach out the intimacy all day. Then see where it leads you. If you make love again, awesome! If not and you end up being together, awesome! Just do not force it, let it flow. Iso.