Suwakoto! by Ryusuitei Touhou Project Doujin and Yotsuba&! Doujin — Ongoing

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Chapter 1: Suwako & Gensokyo released Jan 21 '13
Chapter 2: Suwako & Watermelon released Feb 17 '13
Chapter 3: Suwako & Bamboo released Mar 4 '13
Chapter 4: Suwako & Moving released Mar 17 '13
Chapter 5: Suwako & Dolls released Jun 24 '13 Alice x Marisa
Chapter 6: Suwako & Underworld released Jul 24 '13
Chapter 7: Suwako & Old Lady released Dec 9 '13
Chapter 8 released Jan 26 '14
Chapter 9: Suwako & Diet released May 26 '14
Chapter 10: Suwako & Invitation released Jun 8 '14
Chapter 11: Suwako & Ascetism released Aug 31 '14
Chapter 12 released Aug 31 '14
Chapter 13: C82: Suwako & Sunflowers released Dec 24 '12
Chapter 14: Suwako & The Scarlet Devil Mansion released Sep 23 '16