My Prometheus 2 Movie

Just saw Prometheus. Wasn't blown away by the storyline except for the possibilities that it creates. Very similar to 2001:A space odyssey in that regard. I can envision a follow-up with just the android and Dr. Shaw traveling the universe in search of the engineers. One (uh 2) point of confusion: Android David dropped the DNA goo in Holloway's drink. Why? All indication is that he is programmed & guided by the old man, not to experiment on the crew. This adds to him being ominous, but why? Is he experiencing being curios...a side effect of becoming sentient? Another curiosity...in the very beginning of the movie the engineer self-inficts himself in order to introduce his beings DNA on earth. Why? Why kill yourself? With all their tech could they not just drop some DNA goo in the ocean? If there is a part 2, Here are my suggestions on content for it: 1. Dr. Shaw falls in love with David.Android 2. David.android secretly harbors the engineer DNA goo 3. David.android impregnates shaw after infecting himself 4. Shaw gives birth to techno-organic engineer 5. their ship is captured by engineers 6. David.android infects both ships with his programming 7. DAvid.android has anterior motives for shaw & engineers & their whole world. if he can find it by scanning their systems 8. engineers take both back to home world 9. origins of xenomorph revealed somewhere 10. The rest...up to you