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If youre on the newer versions, there's now the side position to consider. Thus:

undress as needed

Shift hands to be raised

Shift body to side position (click on her side, slightly above her belly and below her chest)

Find the "Shift body" command in the side position (with arm tucked in it's usually a bit lower, slightly above her rear. Otherwise, with arm shifted, it should be along her side slightly above her hip near her belly)

Congratulations! She should now be on her belly. You can proceed to headpat her and shift her legs to access her ass, assuming that you've undressed her enough.

You're on another level

Aight, here's a very special guide specifically for you:

- when you start the night, you see Yuna in her bed under the blanket, she might be laying on her back [1] (face up, fully visible)for on her stomach [2] (face to the side, not fully visible)

- take off the blanket completely, you'll have to click 3-4 times on the upper edge every time it moves a little, until fully taken off

- if [1]: move her hands away from her body, by clicking each hand and completing the minigame, once both arms are to her sides you may proceed to take off her night shirt

- to take off her shirt, simply click the top most button and complete a tracing/maze minigame, repeat for the next top-most button (2nd, 3rd and 4th)

- once you're done with the shirt you can take off her bra and panties in any order, each require completing 2 tracing minigames to be fully taken off (I hope you're clever enough to figure out where to click to take them off)

now she should be in completely naked still laying on her back (face up) with her hands to her sides

- next you want to click each of her arm again to move them up, so that her hands are above her head

- once BOTH her hands are up you will be able to click her waist, a little off to the right side for your POV (her pov that would be left side) and once again complete a minigame to turn her around {IMPORTANT NOTE! Since dev added a <SIDE POSITION> you'll have to click her waist 2 times, not 1} 

- now she should be laying flat on her belly, so you can see her back and ass, her face will look towards the left side (window) and you'll see more of her hair

- once in this position, next thing you need to do is to click each leg somewhere around the thigh area to shift it under her belly, so she ends up in "ass up" or "doggy" position

CONGRATULATIONS! YOU HAVE JUST TURNED HER AROUND AND YOU ARE ABLE TO HAVE SEX FROM BEHIND USING BOTH OF HER HOLES!!!1!1!1!!1!

- if [2]: you need to turn her around first, by clicking on her back in the waist area, and then do all the stuff from [1] part

I hope you'll like this very detailed guide on how to turn her around during the night time adventure and appreciate the time I've wasted writing this guide to help your poor soul in need :)

If, for some unknown reason, you'll still have some problems, or dont know what to do, I'd kindly suggest giving up on playing this game, as it is too complicated for the likes of you and start playing games more suited for younger audiences, as they do not require that much critical thinking and problem solving skills.

Have a nice day, 

Cheers!