If you're looking for anime similar to High School DxD NEW: Oppai, Tsutsumimasu!, you might like these titles.
Basara Toujo is a high school student whose father has suddenly just remarried. His father then departs overseas leaving Basara with two new beautiful step-sisters. Little does he know, his new sisters, Mio and Maria are actually the new Demon Lord and a succubus!? Almost trapped into a life of servitude, Basara forms a reverse contract by accident and ends up becoming Mio’s master! Hijinks ensue as Basara finds himself in one ecchi situation after another. However, Mio’s life is in danger as she is pursued by demons and heroes!
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Shinmai Maou no Testament is really similar than Highschool DXD. It's also an action-fantasy anime which have a similar setting, having 3 different factions which were previously at war (demons, angels and fallen angels in DxD and demons, heroes and gods in Testament) which have their eyes set on the main girl. Also said girl happens to be a red-haired demon. Needless to say it's quite ecchi (though I'd say Testament is way more explicit than DxD). If you enjoyed this one you'll like Shinmai Maou no Testament
What’s the best way to celebrate a birthday? Well, to the succubus Maria, there’s only one thing to do—get Mio and Basara to hook up! Using the guise of Mio’s birthday, and a lust spell, she’s determined to have the perfect setup for a sexy celebration.
Basara finds himself in a compromising situation with the school nurse, but was it all a dream?
Raul Chaser wants to be the Hero famed for defeating the Demon Lord - at least, that used to be his dream, until another warrior beat him to the punch! With peace now restored and all Heroes out of commission, Raul reluctantly gets a job at Leon, a small store that sells magical commodities. Compared to slaying demons, Raul’s new life of greeting customers and working the register is uneventful at best - that is, until Fino Bloodstone, the Demon Lord’s busty daughter, is suddenly hired at the stop! Raul now faces a challenge more difficult than vanquishing her father: teaching the clumsy and ill-mannered Fino how to become a respectable employee, while simultaneously fending off tentacle monsters and putting up with pervy regulars’ skirt-flipping antics!
When Raul’s little sister pays him a surprise visit, Raul and the girls will have to hatch a plan to trick her into thinking he’s really become a hero!
"Problem child" Ash Blake is nothing but a nuisance to his fellow students at Ansullivar Dragonar Academy. Sure, he's got the sacred star brand that marks him as a future master of dragons, but his lack of dragon companion and hot temper make it more than a little difficult for him to play the part of the hero. That is, until his dragon awakens, and he's finally partnered with a fierce, fire-breathing... cute girl? And her human form isn't the only surprise; she's determined to be Ash's master. But when dark forces begin to endanger the lives of dragons and students, Ash and his partner must find a way to work together to defeat them!
After saving a fairy-tale kingdom, Akatsuki returns to the real world with his prize—Myuu, the busty daughter of the defeated Demon King. It’s one hell of a happy ending until they’re forced to enroll at a school for magic users. There, Akatsuki can’t keep his hands off the girls, Myuu’s constantly ballooning measurements make her a walking wardrobe malfunction, and it seems like someone is always plotting against them.