Kirepapa
Tsudere, single father is overly attached to son and pitches fits at any thought that someone will romance him away, even mistaking the true direction of a suitor's affections, which leads to schemes and plot complications.
Concierge No Koibito
Smutty oneshot about college student, Hinata, who is stunned to learn that his good friend, the popular and handsome Yuuma, has been harbouring a secret crush on someone for ages and has never shared this juicy tidbit with him. Determined to acquire experience so he can be Yuuma's "Rock", Hinata accepts a casual date then asks Yuuma how to go on one. Classic idiot couple romance.
Seishun Hensachi
This one goes into the "Be Careful What You Wish For" pile, except this time the Wish-Genie isn't a jerk.
Hajimete no Shitsuren
Not Takagi Ryou's best stuff by any stretch. Multiple stories which fall a bit flat and dull for lack of adequate character development and subtlety. She seems to do better with fantasies.
Shugoreisama Ni Tsuitekoi