I checked Tsuruse's twitter and I gotta ask since I can't read Japanese: there are some other comics with another couple and they vaguely resemble Saaya and Sakura, hell I'm pretty sure Sakura is actually in a couple of these comics too, anyone mind explaining what's going on?
Love Tsuruse by the way, she's also very pretty holy moly.
I think they missed the "what" before "the act," but "the act" is pretty much sex. So, in other words, we have a girl who doesn't know what sex is and her girlfriend who made her feel good.
But yeah, this title is a bit confusing.
I think adding double quotes makes it clearer: A story about a girl who doesn’t know The Act is called "Being made to feel good" by her girlfriend. Therefore: A girl was tricked by her GF to believe that she is "being made to feel good", she doesn't know it's actually having sex.