Buffy & son travel to a navel base where she met spike (the Father); he was a pilot but he died

This is a fic that I read awhile ago Buffy and her son travel back to a navel base where she met spike he was a pilot but he died. I think their was a scene where he asked for underwear!

This sounds like "Waiting for Eternity" by Moxie.

Summary: Eighty three year old Buffy O' Connor and her son William make a nostalgic trip back to a deserted English airbase. Here, she relives memories of the second world war, and in particular a certain Flight Lieutenant Spike Giles, who'd come storming into her life, and into her heart, and had just refused to leave.

OH my God thank you soo much i have been looking for that since october!