I appreciated the title "PC通話でこっそり盗聴 @RiO" and it's sequel so i looked around for these titles (done by the same group) but could not find them anywhere.
Title : 杏奈とお忍びキャンプえっち! ～ほろ酔いアイドルの誘惑～
Link : https://www.dlsite.com/maniax/work/=/product_id/RJ175962.html
Title : 静流とお忍びお祭りえっち! ～清楚系アイドルのおねだり～
Link: https://www.dlsite.com/maniax/work/=/product_id/RJ211990.html
thank you for your time.
