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Callipygian
I'm not all that confident about the last line. 空気だったな seems like she could be saying she's been pretty benign/inactive/unnoticeable/part of the scenery/etc.
_cf
If you read this all series, Sanae has corrupted Youmu so much already, that she can just sit and watch.
6163
Did... did Sanae just make everything better?
Mithiwithi
If Youmu becoming a chubby-chaser is better, then yes.
Personally, I'm not quite sure if I can be as happy with chunky Reisen as Youmu is, but your mileage my vary.