A rather odd piece of work is the "tribute". First off, before going into details on art or style or story, why do the completely black, completely blank pages stay as part of the scan. They are of no use and really break up the examination as you go through one by one. My own personal collection are usually bare of arbitrary sketches and meaningless japanese comedy pages, though I do understand keeping the scans complete for integrity purposes on websites(You never know who might like what, after all) yet I fail to see the purpose in the black pages...
Okay, I ranted on that way to long.
The art here is gorgeous, showing us some nice, askewed versions of these gorgeous girls in full color, then a few nice pinups of some old Xenogears characters. After that, the real down and dirty as Shion and KOS-MOS repay the crew of the Elsa for rescuing them early on in the first game, in the only way they can. Group sex, nice and gooey. They really look into it as well, which is a plus.
After that wonderful scene, which was a tad too short for me, was another Xenogears bit, a comic this time, some more detailed art, but felt mostly like filler. Then a wierd tack on of some pinups from G-Gundam and Chrono Cross.
Ah well. Very good work.

Part 1: Shion and Kos-Mos have group sex with the crew of the Elsa, the have a threesome with Allen.

Part 2: Two charas from Xenogears having sex.

Doujinshi has nice art (both storys) and an average plot.

The artwork at the beginning and the end of the doujinshi vary from really good to average.

Second story besides looks more like a filler than a second part.