Ah okey that's nice with callie solo is it obvious how to get? like walkthrough tells how to do it. Just since the above person didn't even know it was possible
		
		
	 
	
		
	
	
		
		
			I'd be curious too. I thought I'd found all endings and I don't remember a Callie solo.
		
		
	 
Callie's relationship path:
1. Reveal her secrets, alter her sexuality.
2. Ask for nude fashion shows, and push things as far as possible each time.
3. After about 3 nude shows, you'll be able to ask to have sex with her.
You now have two choices: a solo relationship with Callie, or a threesome with Callie and Evelyn. They are mutually exclusive.  If you ever send Evelyn to seduce Callie, that makes the solo path impossible.  If you get the picnic invite from Callie, that makes the threesome path impossible.
For the solo relationship:
4. Ask to have sex with Callie, do so.
5. Talk with Callie.  If she likes you well enough, she will invite you to a picnic, and during the picnic, will ask you to become her boyfriend. Saying yes makes you a couple.
The hard part is making Callie like you enough: do this via fashion shows and working for her. You don't have to have her like you well enough ahead of time.
Shows: you must see every possible outfit (the fancy dress, the forest dress, underwear, and the sexy leather thing).
Work: you must do multiple shifts - I'm not sure exactly how many.  I am pretty sure you must work a double shift for her.
For the threesome path:
4. Be in a relationship with Evelyn.  Have sex with Callie.
5. Without getting a picnic invite from Callie, send Evelyn to seduce her, twice, and join in the second time.
6. Talk with Callie. She says to pretend the threesome never happened.
7. Send Evelyn to Callie two more times and join in each time.   After the third threesome, if Callie likes you well enough, she invites you, through Evelyn, to join her at her house at night.  Agree and you become a throuple.
Note: getting the thouple invite requires doing more work for Callie than the couple invite. The number of shows required is the same.
It's possible to get the invitation from Callie immediately after having sex with her, if you've done enough shifts for her in the early game and seen all the outfits.  Usually, however, I have to spend several mornings working for her after having done all the other steps before I get the invitation.