Here is a Rin and Len centric non-H doujinshi. Scanned by me (Adorable Doujinshi Scanlations) https://adorable-scanlations.blogspot.com/?zx=eb925799e03a17ca
scan #352
Suruga-ya link - https://www.suruga-ya.jp/product/detail/ZHOTI70209?tenpo_cd=
direct download link - https://www.mediafire.com/file/416lb3n155xapye/%2528%25E3%2581%25AD%25E3%2582%258A%25E3%2581%25B2%25E3%2581%25B0%25E3%2582%258A%2529_%25E3%2581%2595%25E3%2581%258F%25E3%2581%25A3%25E3%2581%25A8%25E3%2583%259F%25E3%2583%25AB%25E3%2583%2595%25E3%2582%25A3%25E3%2583%25BC%25E3%2583%25A6_sakutto_mille-feuille.zip/file