This one's interesting, because it will affect what games might qualify, why they join, price points, etc. Are  you promoting a cause (the recent Bundle for Ukraine, for example)? Is this an attempt to sell the game itself? Or perhaps your principal revenue comes from elsewhere (Patreon, for example). Understanding why you're doing it, and getting buy-in from the other bundle participants, is the first step to setting up a successful bundle.  

Step 2: What games to include?

I believe a good bundle shares a central theme. It could be playstyle  (roguealike deckbuilders), art style (cartoony 2D), themes (highschool setting, or  WW2)  or other aspects, as long as you can say to yourself "because a player played game X in the bundle, they're likely to enjoy games Y and Z".  For our bundle  the central theme is Adult Fantasy.  The games themselves are varied; Memoirs of a Battle Brothel is a turn-based strategy game, Love of Magic is an RPG/VN, Vea Victis merges kingdom management and visual novels, etc. Some are  2D, some are 3D. Vea Victis's tale of domination and submission is certainly quite different from the epic romance of Love of Magic, but they're all erotic games that touch on the fantastical and supernatural around us.

Step 3: Putting the bundle together.

Itch.io's bundle system is overall pretty good, but the big bottleneck is that the bundle owner (the poor bastard volunteered to put  it together) needs to be in charge of the text-entry, and cat-herding involved in getting all the information together. Here I think I did a really poor job, and if doing it again I would have simplified things from the get go:

- Set up a google sheet to drive all of this. Makes it easy to see what you're missing and for collaborative editing
- Standardize the  input. We  settled on: Game Title, Game Description (250 characters), Main promo image (1920x1080, PNG), additional images / 3-5 sec video clip for the trailer

Doing it like that (with assets put into a  shared drive and linked) would have simplified my life. Instead I spent time hunting and pecking through a 5 page forum thread looking for assets :) Don't be like me, be smart.

Step 4: Marketing the bundle

We'll see if we've done this one right, and I'd love feedback and suggestions in the comments for what we could have done *better*.  We each have our own communities (Patreon,  Discord, Twitter, etc), so posting there was the first step.  We've also posted in various forums we're active  in, and since we're in different places that might give us some lift. There's obviously a certain organic lift from being on sale on Itch.io, we'll see what that looks like.

So... that's some of my thoughts on this. It's the first time I've tried putting together a bundle like this, so it's been an interesting experience. Let me know in the comments if there's additional stuff  you  would have liked to hear, suggestions and feedback on stuff I should / shouldn't be doing, and other ideas.