I can't read the kanji, but here's the rest. "Abunai yo" usually means "Look out!", but it's written as a question here, so I translated it as one. "Akikan" is another name the artist uses (may or may not be related to the series), and "Credit" is the name of his doujin circle.
Akikan kojinshi wordplay on dojinshi+kojin(personal)Circle CreditOnee-chan abunai yo?
[Is Sis in trouble?]