I think it's about time to admit that I'm not going to sit down and write out the last of this story anytime soon. So, for anyone who might come across this fic and wonder what would have happened next, here's what my ideas were:

The "demons" that Shippo was running from arrive at the tower. Oh no!

The "demons" turn out to be Sango and Kilala (with Sango in particular being identified as the demonic person Shippo was running from.

It is revealed that orphan Shippo was taken in by Sango's villiage

Turns out the reason Shippo was frantically running away was he'd played a prank that got out of hand and ended up flooding a lot of the village. He didn't want to hear his scolding or have to help clean up.

Miroku is smitten with Sango and volunteers to go back with her (and Shippo) to help clean up the village.

Inuyasha is passive-aggressively sad that they're leaving, causing everyone to realize that he can't ever leave the tower, and that's awful. They agree to come back and visit him after cleanup is done.

Some time later they return, and try various different things to release Inuyasha. Nothing works, and they come to the conclusion that only Kikyo can remove the arrow and free Inuyasha. They resolve to find Kikyo and convince her to free him.

Later they come back with bad news: Kikyo is dead. They investigate and find out she had been secretly nursing a criminal named Onigumo, who upon recovery had killed her. Inuyasha has very complicated feelings about this reveal.

The group realizes that Inuyasha is truly stuck, and will need someone to bring in food for him. They agree to continue visiting and bringing supplies.

Some time later, a new person finds and climbs the tower. It's Kikyo?! No, it's not, it's her time-traveling reincarnation, Kagome.

Kagome in brash Kagome fashion removes the arrow. Inuyasha is stunned to find he is free!

The group arrives and are thrilled to find Iuyasha is free! They throw a party with the now-unnecessary supplies they'd brought.

Everyone meets Kagome and hears her time-travel story. Turns out Kagome needs to travel the land searching for some macguffin or other.

Inuyasha is very interested in seeing the world and everything he's been missing out on, and decides to accompany Kagome. The friend group decide they'd like to tag along as well.

Happy The End