Was the party last week or this coming week? You could get together after school during this week - grab a bite to eat together then see if he wants to come over or just hang out.
Eventually you're going to have to be honest with him. Sometime it's easiest just to clear the air and let him know that you're Bi and find him attractive. Just throw it out there and see what happens.
Eventually you're going to have to be honest with him. Sometime it's easiest just to clear the air and let him know that you're Bi and find him attractive. Just throw it out there and see what happens.