"No doubt it's going to be a special occasion for me. I saw the emotion on all the Ulster boys' faces on Saturday after their match," he said.
"That's going to bring something into it. We haven't had a chance to think about that yet. We have to regroup after this one before we even start contemplating Ulster."
The Ireland international spent five years at Ulster before signing for Leinster, and he still has plenty of connections in the northern province.
"I was in touch with a few of them during the week, especially with Chris Henry because I know how desperately he wanted to be a part of what happened on Saturday.
"I'm good mates with a few of them. They've come a long way in this competition. They had a tough pool as well and to get to the final from there is a good effort by them.
"We can't look too far ahead though. We need to reassess what happened here (in Bordeaux), see what we did right and wrong and then have a chance to watch their game properly."
The stakes will be high at Twickenham, with Leinster aiming for a third Heineken Cup title in four seasons and Ulster seeking their first victory since 1999.
As a result it is no surprise that Boss expects to be kept busy in the build-up by trying to fairly distribute his share of tickets for the big day.
"I'll be getting ticket requests from both sides," admitted the 31-year-old. "We'll have to wait and see. It could be an expensive week trying to get tickets for both sides.
"It's one of the negatives of that. You have to try to cater for everyone when you get to the final.
"But I suppose you can't complain too much if you're on the way for the final. It will be nice to have people hassling me if it means we're in a final!"