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配上这个标题，看完只有难受

Base +6

画风进步真快

Base +6

暗恋的人有男人了？

Base +6

BSS
Also the protagonist is in middle school

Base +6, 1vdozPT2zgcxL3Ph +4, lkoofu +10

Lame open end.
The only confirmed thing is that the teacher (who only tells her she's just good enough as sex friend)knew the little kid was hidden below the bed and did the FMC on purpose to show him.
At the end next day MC is hurriedly trying to avoid her going to school without eating but she is as quick for some unknown reason and catches up and greets him, avoids eye contact and meekly says Hi before leaving her with a very serious expression.
Maybe she realized he was hidden because she knew he was going to visit and was odd that MC's mother came to check on him at her house.

Base +23, lkoofu +10

Looks like the comments above didn’t mention certain crucial points that would give the ending more room for interpretation, yes Ren’s former cram schoolteacher Kosaka did notice Marenosuke (pet called “Mare” by Ren) was under Ren’s bed, that’s why he goads Ren to express how much she loves having sex to make sure Mare gets hurt by what he is witnessing in secret, but he also forces Ren to reminisce how long they have been together, 3 years…

That’s the same timeframe as Mare bathed together with Ren three years ago, the time Mare thought he shared a moment that sparked his one-sided feelings was the time Ren was first taken by Kosaka, he never had a chance.

Also it goes further, Kosaka casually makes Ren talk more about her life now, how she is a loose girl that has plenty of sex friends at school, she even opens her legs to younger impressionable boys, Kosaka outright taunts her, asking if Ren is planning to entice the boy who lives nearby, Marenosuke is his name, right? Ren only replies with a suspicious smile…

Mare is left broken and confused yet he came in his pants… he leaves once Ren and Kosaka leave the room. The day afterwards Mare gets up to go to school properly, surprising his mom, now Mare actually leaves home in time for Ren to greet him, something that hasn’t happened in a while, Mare is embarrassed as he recalls what Ren did with Kosaka, so he meekly greets her back and leaves… both Mare and Ren give one last silent look as they go separate ways, THE END.
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Thus it is a ending left for interpretation, Mare is hurt once he finds out Ren’s true nature, but Ren’s expression at the end is peculiar, what is she thinking? Disappointment if her plans were to entice Mare after all but now she thinks it is no longer possible, or she is merely annoyed Mare never tried to make a move like all the sex friends she has? Or it is something else entirely?

Base +22