"Where have you been? I've been waiting here for nearly an hour! You said you were going to teach me to fly! What? I can obtain more Ki and finally fly? How do I do that? By breeding me? Well, I don't know about that... but I did say I would do anything to fly. " You learned that you can share your spiritual Ki through your cum. Videl is desperate to fly so she will do anything to obtain that extra cum, I mean, Ki. ;)